陕北矿区煤矸石淋滤试验研究

发布时间：2018-08-01 09:02

【摘要】：露天堆积的煤矸石遭雨淋滤后易污染环境。以陕北矿区煤矸石为研究对象,利用自主研制淋滤仪器,模拟降雨工况,尝试不同降雨强度及矸石粒径条件下淋滤试验,结果表明:淋滤液电导率随时间表现为"快降—缓降—趋稳波动"3个阶段,Cr浓度随时间表现为"快降—缓降(或趋稳波动)"2个阶段;降雨强度增大68%时,大、小粒径组的电导率平均值分别降低18.9%、24.6%,Cr浓度平均值分别降低18.8%、22.0%;平均粒径增大50%时,大、小雨强组的电导率平均值分别降低4.0%、10.7%,Cr浓度平均值分别增大34.5%、29.2%。主要结论:矸石可溶元素释放呈指数衰减规律,雨强对可溶元素整体淋出水平更为敏感;Cr淋出过程与其他可溶物相似,遵循淋出浓度分段降低逐渐趋稳的规律,粒径对Cr淋出水平更为敏感;矸石风化面较新鲜面更早达到Cr释放峰值,导致淋滤后期浓度波动;可溶元素的整体释放水平决定于试样总表面积,但Cr主要由矸石风化表面淋出。
[Abstract]:The coal gangue accumulated in the open air is liable to pollute the environment after it is leached by rain. Taking coal gangue in the mining area of northern Shaanxi as the research object, the leaching test under different rainfall intensity and particle size of gangue was tried by using the self-made leaching instrument to simulate the rainfall condition. The results show that the conductivity of leaching filtrate shows two stages with time: "fast down-slow down-stability fluctuation", and when the rainfall intensity increases 68th, the Cr concentration increases, and the Cr concentration fluctuates with time, and when the rainfall intensity increases 68%, Cr concentration increases, and Cr concentration fluctuates slowly and slowly with time, and when rainfall intensity increases 68%, Cr concentration increases with time. The average conductivity of small diameter group was decreased by 18.9% and the average value of Cr concentration was decreased by 18.8% and 22.0, respectively. When the average particle size was increased 50, the average conductivity of heavy rain group and light rain group was decreased by 4.0% and 10.7%, respectively, and the average value of Cr concentration increased by 34.5% and 29.2%, respectively. The main conclusions are as follows: the release of soluble elements of gangue shows an exponential attenuation law, and the leaching process of Cr is more sensitive to the whole leaching level of soluble elements, and follows the law that the leaching concentration decreases gradually and stabilizes gradually. The particle size is more sensitive to Cr leaching level, the peak value of Cr release from the weathering surface of gangue is earlier than that of fresh surface, which leads to the fluctuation of concentration in the late leaching period, and the overall release level of soluble elements is determined by the total surface area of the sample. However, Cr is mainly leached from the weathered surface of gangue.
【作者单位】：西安科技大学地质与环境学院;陕西省地质调查院;
【基金】：国家自然科学基金项目(41572287,40972174);国家自然科学基金重点项目(41130753) 陕西省科技统筹创新工程计划项目(2013KTCL03-15) 陕西省煤田地质局科技计划项目(JB2014-4)~~
【分类号】：X752

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